[NH:1]([C:3]1[N:4]=[N:5][C:6]([N:9]2[CH:13]=[CH:12][N:11]=[C:10]2[CH3:14])=[CH:7][CH:8]=1)[NH2:2].[CH3:15][C:16]([CH3:18])=O>>[C:16](=[N:2][NH:1][C:3]1[N:4]=[N:5][C:6]([N:9]2[CH:13]=[CH:12][N:11]=[C:10]2[CH3:14])=[CH:7][CH:8]=1)([CH3:18])[CH3:15]3.0 g (15.8 millimoles) of 3-hydrazino-6-(2-methyl-imidazol-1-yl)-pyridazine are suspended in 40 ml of acetone and the suspension is heated for 10 minutes on a steam bath under reflux.
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